import java.util.*;

public class Example3_9 {

    public static void main (String args[ ]){

      Scanner reader=new Scanner(System.in);

      double sum=0;

       int m=0;

       while(reader.hasNextDouble()){

           double x=reader.nextDouble();

           m=m+1;

           sum=sum+x;

       }

       System.out.printf("%d个数的和为%f\n",m,sum);

       System.out.printf("%d个数的平均值是%f\n",m,sum/m); 

    }

}
